1 #ifndef _SPARC_PGTABLE_H 2 #define _SPARC_PGTABLE_H 3 4 /* asm/pgtable.h: Defines and functions used to work 5 * with Sparc page tables. 6 * 7 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 8 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 9 */ 10 11 #ifndef __ASSEMBLY__ 12 #include <asm-generic/4level-fixup.h> 13 14 #include <linux/spinlock.h> 15 #include <linux/swap.h> 16 #include <asm/types.h> 17 #ifdef CONFIG_SUN4 18 #include <asm/pgtsun4.h> 19 #else 20 #include <asm/pgtsun4c.h> 21 #endif 22 #include <asm/pgtsrmmu.h> 23 #include <asm/vac-ops.h> 24 #include <asm/oplib.h> 25 #include <asm/btfixup.h> 26 #include <asm/system.h> 27 28 29 struct vm_area_struct; 30 struct page; 31 32 extern void load_mmu(void); 33 extern unsigned long calc_highpages(void); 34 35 BTFIXUPDEF_SIMM13(pgdir_shift) 36 BTFIXUPDEF_SETHI(pgdir_size) 37 BTFIXUPDEF_SETHI(pgdir_mask) 38 39 BTFIXUPDEF_SIMM13(ptrs_per_pmd) 40 BTFIXUPDEF_SIMM13(ptrs_per_pgd) 41 BTFIXUPDEF_SIMM13(user_ptrs_per_pgd) 42 43 #define pte_ERROR(e) __builtin_trap() 44 #define pmd_ERROR(e) __builtin_trap() 45 #define pgd_ERROR(e) __builtin_trap() 46 47 BTFIXUPDEF_INT(page_none) 48 BTFIXUPDEF_INT(page_copy) 49 BTFIXUPDEF_INT(page_readonly) 50 BTFIXUPDEF_INT(page_kernel) 51 52 #define PMD_SHIFT SUN4C_PMD_SHIFT 53 #define PMD_SIZE (1UL << PMD_SHIFT) 54 #define PMD_MASK (~(PMD_SIZE-1)) 55 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) 56 #define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift) 57 #define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size) 58 #define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask) 59 #define PTRS_PER_PTE 1024 60 #define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd) 61 #define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd) 62 #define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd) 63 #define FIRST_USER_ADDRESS 0 64 #define PTE_SIZE (PTRS_PER_PTE*4) 65 66 #define PAGE_NONE __pgprot(BTFIXUP_INT(page_none)) 67 extern pgprot_t PAGE_SHARED; 68 #define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy)) 69 #define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly)) 70 71 extern unsigned long page_kernel; 72 73 #ifdef MODULE 74 #define PAGE_KERNEL page_kernel 75 #else 76 #define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel)) 77 #endif 78 79 /* Top-level page directory */ 80 extern pgd_t swapper_pg_dir[1024]; 81 82 extern void paging_init(void); 83 84 /* Page table for 0-4MB for everybody, on the Sparc this 85 * holds the same as on the i386. 86 */ 87 extern pte_t pg0[1024]; 88 extern pte_t pg1[1024]; 89 extern pte_t pg2[1024]; 90 extern pte_t pg3[1024]; 91 92 extern unsigned long ptr_in_current_pgd; 93 94 /* Here is a trick, since mmap.c need the initializer elements for 95 * protection_map[] to be constant at compile time, I set the following 96 * to all zeros. I set it to the real values after I link in the 97 * appropriate MMU page table routines at boot time. 98 */ 99 #define __P000 __pgprot(0) 100 #define __P001 __pgprot(0) 101 #define __P010 __pgprot(0) 102 #define __P011 __pgprot(0) 103 #define __P100 __pgprot(0) 104 #define __P101 __pgprot(0) 105 #define __P110 __pgprot(0) 106 #define __P111 __pgprot(0) 107 108 #define __S000 __pgprot(0) 109 #define __S001 __pgprot(0) 110 #define __S010 __pgprot(0) 111 #define __S011 __pgprot(0) 112 #define __S100 __pgprot(0) 113 #define __S101 __pgprot(0) 114 #define __S110 __pgprot(0) 115 #define __S111 __pgprot(0) 116 117 extern int num_contexts; 118 119 /* First physical page can be anywhere, the following is needed so that 120 * va-->pa and vice versa conversions work properly without performance 121 * hit for all __pa()/__va() operations. 122 */ 123 extern unsigned long phys_base; 124 extern unsigned long pfn_base; 125 126 /* 127 * BAD_PAGETABLE is used when we need a bogus page-table, while 128 * BAD_PAGE is used for a bogus page. 129 * 130 * ZERO_PAGE is a global shared page that is always zero: used 131 * for zero-mapped memory areas etc.. 132 */ 133 extern pte_t * __bad_pagetable(void); 134 extern pte_t __bad_page(void); 135 extern unsigned long empty_zero_page; 136 137 #define BAD_PAGETABLE __bad_pagetable() 138 #define BAD_PAGE __bad_page() 139 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) 140 141 /* 142 */ 143 BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t) 144 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t) 145 146 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd) 147 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd) 148 149 BTFIXUPDEF_SETHI(none_mask) 150 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t) 151 BTFIXUPDEF_CALL(void, pte_clear, pte_t *) 152 153 static inline int pte_none(pte_t pte) 154 { 155 return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask)); 156 } 157 158 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte) 159 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte) 160 161 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t) 162 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t) 163 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *) 164 165 static inline int pmd_none(pmd_t pmd) 166 { 167 return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask)); 168 } 169 170 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd) 171 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd) 172 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd) 173 174 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t) 175 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t) 176 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t) 177 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *) 178 179 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd) 180 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd) 181 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd) 182 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd) 183 184 /* 185 * The following only work if pte_present() is true. 186 * Undefined behaviour if not.. 187 */ 188 BTFIXUPDEF_HALF(pte_writei) 189 BTFIXUPDEF_HALF(pte_dirtyi) 190 BTFIXUPDEF_HALF(pte_youngi) 191 192 static int pte_write(pte_t pte) __attribute_const__; 193 static inline int pte_write(pte_t pte) 194 { 195 return pte_val(pte) & BTFIXUP_HALF(pte_writei); 196 } 197 198 static int pte_dirty(pte_t pte) __attribute_const__; 199 static inline int pte_dirty(pte_t pte) 200 { 201 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi); 202 } 203 204 static int pte_young(pte_t pte) __attribute_const__; 205 static inline int pte_young(pte_t pte) 206 { 207 return pte_val(pte) & BTFIXUP_HALF(pte_youngi); 208 } 209 210 /* 211 * The following only work if pte_present() is not true. 212 */ 213 BTFIXUPDEF_HALF(pte_filei) 214 215 static int pte_file(pte_t pte) __attribute_const__; 216 static inline int pte_file(pte_t pte) 217 { 218 return pte_val(pte) & BTFIXUP_HALF(pte_filei); 219 } 220 221 static inline int pte_special(pte_t pte) 222 { 223 return 0; 224 } 225 226 /* 227 */ 228 BTFIXUPDEF_HALF(pte_wrprotecti) 229 BTFIXUPDEF_HALF(pte_mkcleani) 230 BTFIXUPDEF_HALF(pte_mkoldi) 231 232 static pte_t pte_wrprotect(pte_t pte) __attribute_const__; 233 static inline pte_t pte_wrprotect(pte_t pte) 234 { 235 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti)); 236 } 237 238 static pte_t pte_mkclean(pte_t pte) __attribute_const__; 239 static inline pte_t pte_mkclean(pte_t pte) 240 { 241 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani)); 242 } 243 244 static pte_t pte_mkold(pte_t pte) __attribute_const__; 245 static inline pte_t pte_mkold(pte_t pte) 246 { 247 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi)); 248 } 249 250 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t) 251 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t) 252 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t) 253 254 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte) 255 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte) 256 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte) 257 258 #define pte_mkspecial(pte) (pte) 259 260 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) 261 262 BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t) 263 #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte) 264 #define pte_page(pte) pfn_to_page(pte_pfn(pte)) 265 266 /* 267 * Conversion functions: convert a page and protection to a page entry, 268 * and a page entry and page directory to the page they refer to. 269 */ 270 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t) 271 272 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t) 273 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int) 274 BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t) 275 276 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot) 277 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot) 278 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space) 279 280 #define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot) 281 282 BTFIXUPDEF_INT(pte_modify_mask) 283 284 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; 285 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 286 { 287 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) | 288 pgprot_val(newprot)); 289 } 290 291 #define pgd_index(address) ((address) >> PGDIR_SHIFT) 292 293 /* to find an entry in a page-table-directory */ 294 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 295 296 /* to find an entry in a kernel page-table-directory */ 297 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 298 299 /* Find an entry in the second-level page table.. */ 300 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long) 301 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr) 302 303 /* Find an entry in the third-level page table.. */ 304 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long) 305 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr) 306 307 /* 308 * This shortcut works on sun4m (and sun4d) because the nocache area is static, 309 * and sun4c is guaranteed to have no highmem anyway. 310 */ 311 #define pte_offset_map(d, a) pte_offset_kernel(d,a) 312 #define pte_offset_map_nested(d, a) pte_offset_kernel(d,a) 313 314 #define pte_unmap(pte) do{}while(0) 315 #define pte_unmap_nested(pte) do{}while(0) 316 317 /* Certain architectures need to do special things when pte's 318 * within a page table are directly modified. Thus, the following 319 * hook is made available. 320 */ 321 322 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t) 323 324 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval) 325 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 326 327 struct seq_file; 328 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *) 329 330 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p) 331 332 /* Fault handler stuff... */ 333 #define FAULT_CODE_PROT 0x1 334 #define FAULT_CODE_WRITE 0x2 335 #define FAULT_CODE_USER 0x4 336 337 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t) 338 339 #define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte) 340 341 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long, 342 unsigned long, unsigned int) 343 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int) 344 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len) 345 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len) 346 347 extern int invalid_segment; 348 349 /* Encode and de-code a swap entry */ 350 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t) 351 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t) 352 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long) 353 354 #define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x) 355 #define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x) 356 #define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off) 357 358 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 359 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 360 361 /* file-offset-in-pte helpers */ 362 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte); 363 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff); 364 365 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte) 366 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off) 367 368 /* 369 * This is made a constant because mm/fremap.c required a constant. 370 * Note that layout of these bits is different between sun4c.c and srmmu.c. 371 */ 372 #define PTE_FILE_MAX_BITS 24 373 374 /* 375 */ 376 struct ctx_list { 377 struct ctx_list *next; 378 struct ctx_list *prev; 379 unsigned int ctx_number; 380 struct mm_struct *ctx_mm; 381 }; 382 383 extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */ 384 extern struct ctx_list ctx_free; /* Head of free list */ 385 extern struct ctx_list ctx_used; /* Head of used contexts list */ 386 387 #define NO_CONTEXT -1 388 389 static inline void remove_from_ctx_list(struct ctx_list *entry) 390 { 391 entry->next->prev = entry->prev; 392 entry->prev->next = entry->next; 393 } 394 395 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry) 396 { 397 entry->next = head; 398 (entry->prev = head->prev)->next = entry; 399 head->prev = entry; 400 } 401 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry) 402 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry) 403 404 static inline unsigned long 405 __get_phys (unsigned long addr) 406 { 407 switch (sparc_cpu_model){ 408 case sun4: 409 case sun4c: 410 return sun4c_get_pte (addr) << PAGE_SHIFT; 411 case sun4m: 412 case sun4d: 413 return ((srmmu_get_pte (addr) & 0xffffff00) << 4); 414 default: 415 return 0; 416 } 417 } 418 419 static inline int 420 __get_iospace (unsigned long addr) 421 { 422 switch (sparc_cpu_model){ 423 case sun4: 424 case sun4c: 425 return -1; /* Don't check iospace on sun4c */ 426 case sun4m: 427 case sun4d: 428 return (srmmu_get_pte (addr) >> 28); 429 default: 430 return -1; 431 } 432 } 433 434 extern unsigned long *sparc_valid_addr_bitmap; 435 436 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 437 #define kern_addr_valid(addr) \ 438 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) 439 440 extern int io_remap_pfn_range(struct vm_area_struct *vma, 441 unsigned long from, unsigned long pfn, 442 unsigned long size, pgprot_t prot); 443 444 /* 445 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in 446 * its high 4 bits. These macros/functions put it there or get it from there. 447 */ 448 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) 449 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) 450 #define GET_PFN(pfn) (pfn & 0x0fffffffUL) 451 452 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 453 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ 454 ({ \ 455 int __changed = !pte_same(*(__ptep), __entry); \ 456 if (__changed) { \ 457 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ 458 flush_tlb_page(__vma, __address); \ 459 } \ 460 (sparc_cpu_model == sun4c) || __changed; \ 461 }) 462 463 #include <asm-generic/pgtable.h> 464 465 #endif /* !(__ASSEMBLY__) */ 466 467 #define VMALLOC_START 0xfe600000 468 /* XXX Alter this when I get around to fixing sun4c - Anton */ 469 #define VMALLOC_END 0xffc00000 470 471 472 /* We provide our own get_unmapped_area to cope with VA holes for userland */ 473 #define HAVE_ARCH_UNMAPPED_AREA 474 475 /* 476 * No page table caches to initialise 477 */ 478 #define pgtable_cache_init() do { } while (0) 479 480 #endif /* !(_SPARC_PGTABLE_H) */ 481